freemarker.core.StringLiteral Maven / Gradle / Ivy
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Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.core;
import freemarker.template.*;
import java.io.*;
final class StringLiteral extends Expression implements TemplateScalarModel {
private final String value;
private TemplateElement interpolatedOutput;
StringLiteral(String value) {
this.value = value;
}
void checkInterpolation() throws ParseException {
if (value.length() > 3 && (value.indexOf("${") >= 0 || value.indexOf("#{") >= 0)) {
SimpleCharStream scs = new SimpleCharStream(new StringReader(value), beginLine, beginColumn+1, value.length());
FMParserTokenManager token_source = new FMParserTokenManager(scs);
token_source.onlyTextOutput = true;
FMParser parser = new FMParser(token_source);
parser.template = getTemplate();
try {
interpolatedOutput = parser.FreeMarkerText();
}
catch(ParseException e) {
e.setTemplateName(getTemplate().getName());
throw e;
}
this.constantValue = null;
}
}
TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
return new SimpleScalar(getStringValue(env));
}
public String getAsString() {
return value;
}
String getStringValue(Environment env) throws TemplateException {
if (interpolatedOutput == null) {
return value;
}
else {
TemplateExceptionHandler teh = env.getTemplateExceptionHandler();
env.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
try {
return env.renderElementToString(interpolatedOutput);
}
catch (IOException ioe) {
throw new TemplateException(ioe, env);
}
finally {
env.setTemplateExceptionHandler(teh);
}
}
}
public String getCanonicalForm() {
// return "\"" + StringUtil.FTLStringLiteralEnc(value) + "\"";
return "\"" + escapeString(value) + "\"";
}
boolean isLiteral() {
return interpolatedOutput == null;
}
Expression _deepClone(String name, Expression subst) {
StringLiteral cloned = new StringLiteral(value);
cloned.interpolatedOutput = this.interpolatedOutput;
return cloned;
}
static private String escapeString(String s) {
if (s.indexOf('"') == -1) {
return s;
}
java.util.StringTokenizer st = new java.util.StringTokenizer(s, "\"", true);
StringBuffer buf = new StringBuffer();
while (st.hasMoreTokens()) {
String tok = st.nextToken();
if (tok.equals("\"")) {
buf.append('\\');
}
buf.append(tok);
}
return buf.toString();
}
}